Sponsored by FlytrapStore. Support the community - Shop at FlytrapStore. Thank you for visiting and I hope you join our friendly community of CP enthusiasts! Flow Hood - Build Thread. Flow Hood - Build Thread I completed the first step today by acquiring the HEPA filter. I will update this thread as I progress so you all can see exactly how I build the flowhood and why I decide to do things the way I do.

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Hopefully someone else can benefit from this build, and hopefully others can offer my advice as I build it! So, step one was acquiring the HEPA.

I managed to find locally a 24" x 12" x 6" - Pictured here: Next, of course is to find the right blower to match to the filter. Then, the build of the frame. I've got access to a large supply of wood of all sorts of sizes. So hopefully I'll be able to find some good pieces. Wish me luck! User mini profile.

Growing Mushrooms at Home DIY HEPA Flowhood Design

Re: Flow Hood - Build Thread Good luck to you and let us know how it goes! My Growlist Eat Plants! Leave the meat for our pet plants. I have found a PDF with some exemplary calculations. Hope this helps! But we can understand the Universe.Let me know your email above and I'll send 'em over to you right away!

This is the full build plans for our 24 x 48" hood, including all dimensions, all cuts, and everything else you need to know to build you very own flow hood! It's a little complicated, but I broke it down into three simple steps that anyone can use to properly specify their components.

Check it out! Of course, if you don't want to do any of that, and just want to find a combination that works, feel free to just copy the exact build as outlined in the video below!

And be sure to also sign up to get the build plans that include dimensions, materials list, and suggested tools. The fan can be bought on Amazon, or from Electric Motor Warehouse. I am not affiliated with them at all, but had a great purchasing experience there.

The filter can be harder to find. I got the one used in this video from a local supplier, but you can check out AAF Flanders and contact them to find a distributor. The have a 24" x 24" version and a 16" x 16" version available on Amazon.

Laminar Flow Hood

You can also check out these Dayton fans to find one that works for a smaller filter, following the instructions in the video. Wanna make your very own flow hood? Mushrooms For Health. Health Blog.

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Free eBook! Buy Extracts. Grow Mushrooms. Start Here! Best Mushrooms to Grow. Mushroom Growing Terms. Growing Supplies.A laminar flow hood is a piece of equipment which makes sterile working procedures in mushroom cultivation easier and reliable.

A flow hood consists of a coarse pre-filter, a blower and a very fine filter the so called HEPA High Efficiency Particulate Air filter which filters particles from the air to a high degree.

This makes the air coming out of the HEPA filter nearly sterile which allows doing transfers in this stream of sterile air without worrying about contaminants entering from the air and contaminating the cultures. The HEPA filter size depends on how big you want to have your working space. The smallest filter size you can reasonably use for home scale cultivation is 1ft x 1ft, better though 1ft x 2ft or 2ft x 2ft if you are going to inoculate filter bags. USA Filter search web site.

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Once you decided on the size of the HEPA filter, you have to match a suitable blower to this particular filter. This is a very important step, so make sure to study the directions thoroughly. Every filter has a "resistance" when air blows through it at a certain speed, this resistance is called the "static pressure".

Press your hand against your mouth. Now try to blow through it. Dependant on how firm you press it against your mouth, you will have some difficulties blowing air out and you will feel some resistance, this is the static pressure. Every filter has a different static pressure at the working point. The working point is where the amount of the air flowing through the filter is sufficient to meet the requirement of the laminar flow.

The static pressure is expressed in inch of water column in the English units, a typical value would be 1", the SI unit for pressure is Pa Pascal. Each filter has a data sheet consult the manufacturer if this is not the case with your filter where the static pressure at the working point is entered.

Before the air enters the blower it is usually pre-filtered by a furnace filter around 1" 2.

flowhood build

It can be assumed that the static pressure for this prefilter at the working point is around 0. According to Stamets Paul Stamets and J.

Chilton: The Mushroom Cultivator p. Determining the correct blower for a filter consists of several steps:. Find out the area of your filter by multiplying the width and the hight in feet for instance the smallest reasonably usable filter would be 2ft x 1ft.

So if you use the above filter with 1" Pa static pressure and a furnace prefilter with a static pressure of 0. Each blower has a data sheet consult the manufacturer if this is not the case with your blower where the correlation between the volumetric flow and the static pressure is represented by a graph or table.

Here is such a set of curves for 4 blowers numbered NOTE: Each model of a blower has his own characteristic curve. This chart shows the curves for 4 different particular models of axial duct blowers. What you can clearly see is that the bigger the static pressure the less air the blower deliversup to the maximum static pressure where the air output is zero. By now you know how much your blower must deliver and at which static pressure.

So we have to choose a blower that best approximates our requirements. In most cases we should choose a stronger blower, if it's not too strong.

flowhood build

How strong is too strong? In this case we go for the smaller and cheaper blower Nr. NOTE: This chart is only an example for a set of 4 particular blowers. The curves of the blowers available to you may look a bit different, but similar.

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Usually, if you search long enough, you will be able to find a blower that exactly matches your HEPA. The design in this pictorial uses an in-line centrifugal fananother good option actually the one most commonly used for flow hoods is a squirrel cage blower also called shaded pole blower. You can get many blowers at ebay.Keeping mold spores, bacteria, and other nastiness out of your mushroom spawn is a constant fight for the cultivator.

You could use a glove box with a pretty high rate of success, but anyone who wants to get serious about growing mushrooms needs to consider using a laminar flow bench. Having a clean stream of air to work in is way more comfortable and much easier to use than an awkward glove box.

A properly constructed laminar flow bench can allow for ultra clean laboratory conditions even in a not so clean environment such as your kitchen or basement, greatly increasing chances of success for a home cultivator. The idea is to provide a smooth and constant flow of clean air over a work bench. Working within this flow using proper techniques should allow for petri dishes and spawn jars to be open without risking mold spores or other contaminants getting in.

Building a DIY Flow Hood

The end result is easier and more successful inoculations, grain to grain transfers and agar work. The main consideration when choosing a filter is size.

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Bigger filters, however, require a more powerful and more expensive fan to push through the required amount of air. You want the filter to have an efficiency rating of at least This means that the filter will stop Another consideration when choosing a filter is the static pressure. Most HEPA filters will have between 0.

This is simply a measure of the amount of friction between the filter media and the air being pushed through the filter. You will also want to add a pre-filter, which is cheaper and easier to replace than a HEPA and will stop big particles from clogging up your filter. It is generally installed at the intake of the blower fan.

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You can use cut-to-fit vent filters to customize the pre-filter to the size you need. This pre-filter will have a static pressure of 0. This is actually quite a lot of static pressure and requires an adequately sized fan in order to provide a sufficient stream of clean air over your work area.

The information for both the efficiency and the static pressure of the filter should be provided by the manufacturer. You are unlikely to find this type of HEPA filter locally, however, there are many sources online, offering a number of different sizes. NOTE : Make sure you get a proper deep seated filter, such as the ones listed above in order to get smooth laminar flow through the face of the filter.

Laminar flow hoods typically use a squirrel cage type blower fan that is mounted on top of the hood. These fans are rated based on the volume of air that they produce at zero static pressure in cubic feet per minute CFM. As the static pressure increases, the amount of air the fan can produce decreases. For mushroom cultivation, it is generally suggested that the stream of clean air should flow over the workbench at a speed of feet per minute.

Therefore, the volumetric flow rate of clean air required for mycological work is 3. A typical performance curve for blower fans will look like this:. The fan in this example has two speeds, Lo and Hi, as shown in the chart. We can find out the volumetric flow rate of the fan at our static pressure by looking at the curve.From www.

A flow hood is a very useful piece of equipment which makes sterile work in mushroom cultivation easyer and more reliable. Basicaly it consists of a coarse pre-filter, a blower and a very fine filter the so called HEPA H igh E fficiency P articulate A ir filter which filters particles from air to a degree that the air coming out of the HEPA filter is nearly sterile.

One can then work in this stream of air without worrying about contaminants entering from the air and contaminating the cultures. Some sources for hepa filters: U S A : www. You should begin the construction by selecting a filter and a blower. The filter size depends on how big you want to have your working space. The smallest filter size you can reasaonably use for home scale cultivation is 1 ft X 1 ft, better though 1ft x 2ft.

When you decide on the filter, you have to match a suitable blower to this particular filter. You should mount a good, thick prefilter furnace filtersince this blower is a bit overpowered. The design in the pictorial uses an in-line centrifugal fananother good option actually the one most used for flow hoods is a squirrel cage blower also called shaded pole blower. Flow Hoods : Gloveboxes : Archive Main. Flowhood pictorial From www.The idea of this build being to greatly improve the reliability of the aseptic protocols in our lab.

To come up with the design I did a lot of research and ended up finding some great resources on various psychedelic mushroom growing forums, a surprisingly good resource. The design that is popular and that I ended up going with at least for mk I of the flow hood is essentially just a box with a fan blowing in one side and the HEPA filter mounted on another side. While the construction side of things is therefore rather simple, the crucial aspect is actually achieving a laminar airflow by pairing a suitable fan with your chosen filter.

I found that this guide by EvilMushroom explained the maths of figuring out what fan to pair with what filter really well. In summary, you need to source a fan that is capable of blowing enough air for the size of your filter at the given amount of pressure drop back pressure that your filter creates. So step 1 was to find a filter that was reasonably priced and would give a decently sized working area. Filter sorted. It seems that most people have to resort to squirrel cage blower fans to achieve the kinds of airflow necessary despite the high pressure drop of HEPA filters.

However, after several hours of looking through fans on mouser. Now came the assembly, which was essentially just the building of a box.

And though being located in a hackspace certainly helps with getting this done, this could all be done with very minimal tools should you not have access to a fully kitted out workshop. Finally, I attached a prefilter and we connected the fan to a power supply and overvolted it a tad to reach the required airflow. We tested to see if the air coming out of the filter was indeed laminar using a bit of liquid nitrogen and some water to produce a thick cloud of easily visible moist air.

The final test was to carry out a dummy plating procedure where the LB agar plates were not inoculated with anything but then incubated for a few days.

For attempt 2 we created a raised shelf in front of the filter on which to work, and this lead to success. In this improved configuration, our controls, where the plating was done outside the clean airflow, were covered in a colourful mosaic of colonies. And, apart from the two plates that were furthest away from the filter at the corners of the clean work area, the rest of the plates were completely sterile.

However since we would rather not waste time and petri dishes by doing further dedicated experiments to establish the effectiveness of the DIY flowhood, we have marked the 8 spaces in which petri dishes can be placed in the sterile area.

Over time we should build up a nice picture of the statistical likelihood of contamination based on the spatial position of within the sterile area. This is only the beginning however. I have as yet not found any examples of people constructing a vertical laminar flow cabinet, and as you can see from the wiki page for this project, that is the eventual aim of the DIY flow hood mk II.

HEPA filters are often sold as replacement items for office air purifiers.Log in or Sign up. Joined: May 27, Messages: 2, Location: Canada. Here is my write up for the construction of my flow hood. After spending a year working inside of a glove box I had enough.

I found the more I learned about agar and culture storage the more time I spent inside of my GB. After working in your GB for hours at a time your back starts to hurt, your arms start to hurt, and your time starts to dwindle as you are constantly loading and unloading your glove box. After realizing I could not afford to order a pre-built hood I choose to build my own. Here are the thought processes, obstacles, trials and tribulations I have encountered with building a hood from within Canada.

I had a lot of help from many different members of the Shroomery, so many to list that I will not name drop here and just say a big thank you to everyone who has given me input. Also if my blower ever dies on me it is not under warranty, were as most new blowers are warrantied for years.

Something to keep in mind. Find out the area of your filter by multiplying the width and the height in feet. RogerRabbit Note: "In a perfect world, a cfm motor would supply that much. I usually add ten to twenty percent to that figure.

Problem was is most cases the shipping Minus duties and taxes cost more then the bloody filter!

flowhood build

Using the list for HEPA sources on Fungi Fun I found a Canadian supplier that treated me well, found me exactly what I needed, and even made special shipping arrangements to spare me any shipping costs. Get on the phones people! Call around and talk to as many companies as possible and get quotes to find the best deal. I had the option of a 6" Deep Filter, or a 12" Deep filter and I was not sure which would be better for my intended application RR to the rescue!

In these cases, you need to run at a lower static pressure, because you really don't want more than feet per minute leaving your hood. Based on the specs above, I'd go with the 6" deep filter because it has higher resistance. The resistance is what helps achieve laminar flow by creating pressure on the back side of the filter.

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If every inch of the back side is under pressure, the air flows smoothly out the front side.

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